HD3SS3220: Asking for the HD3SS3220 design suggestion

do you still use type-C connector?

Hi Brian,

No type C connector. only use as 2:1 switch for U3 signals.

BR,

SHH

Hi Brian,

is that possible for this application pull high or low on CC pin?

BR,

SHH

CC communication is used to determine which path of mux is on. if you use I2C, it may work.

Regards

brian

Hi Brian,

Thanks for feedback. if using I2C mode, should customer set 0x0A=0x10 in UFP mode to disable VCONN power?

and custome can use register 0x09 to control the path of MUX?

Would you please review and provide comment for the following pins design if using I2C mode for Mux purpose only?

attache the excel.

HD3SS3220.xlsx

thanks for help!

BR,

SHH

let me check with system to confirm.

Regards

Brian

After confirmed by system engineer, HD3SS3220 Mux direction can not be controlled by I2C. So it can not used as HD3SS6126. without CC.

Regards

brian

Hi Brian,

Thanks for feedback.

Is that possible to control CC1/CC2 voltage by pulling low or pulling high on CC pin by external on-board MCU's GPIO to simulate the CC attaced?

BR,

SHH

how do you know which side of USB device is connected?

Hi Brian,

Customer will use MCU's GPIO to control the direction which is like an passive mux HD3SS6126 with direction control.

BR,

SHH

If they know direction to control HD3SS6126, the they can control CC pin which decide the DIR of HD3Ss3220.

Regards

Brian

Hi Brian,

Would you please review the schematic and provide comment to see any concern for this?
Can customer just use one GPIO (GPIO1=GPIO2)?

What is the resistor R1 value suggested?

BR,

SHH

for ufp, you need to see 56k pullup from dfp. need to use both gpio1 and gpo2.

Regards

brian

Hi Brian,

Thanks for feedback.

I saw the Source CC termination requirement in below table.

could I confirm with you that the pull-up voltage and Rp value? 56kohm to 3.3V?

BR,

SHH